The names given to the various lines of a tooth on a gear-wheel are as follows:
In Figure 233, A is the face and B the flank of a tooth, while C is the point, and D the root of the tooth; E is the height or depth, and F the breadth. P P is t... Read more of Drawing Gear Wheels at How to Draw.ca

The report of that fulfilment is the regular, unchanging rule

The report of that fulfilment is the regular, unchanging rule To
know that unchanging rule is to be intelligent; not to know it leads
to wild movements and evil issues The knowledge of that unchanging
rule produces a (grand) capacity and forbearance, and that capacity
and forbearance lead to a community (of feeling with all things)
From this community of feeling comes a kingliness of character; and he
who is king-like goes on to be heaven-like In that likeness to
heaven he possesses the Tao Possessed of the Tao, he endures long;
and to the end of his bodily life, is exempt from all danger of decay